Meaning: The sentence captures the cheerful sounds of children playing and having fun in a playground.
Choice of Words: Children are the subject, laughed conveys their happiness, joyfully emphasizes their delight, and playground is the location.
Meaning: The kids were really enjoying themselves and they were laughing because they were having so much fun on the swings.
Choice of Words: The kids were laughing and having a lot of fun on the swings. They were so happy that they were giggling.
Meaning: The youngsters were really enjoying themselves and they were laughing because they were having so much fun in the sandbox.
Choice of Words: The youngsters were laughing and having a lot of fun in the sandbox. They were so happy that they were chuckling.